US20040221570A1 - Lightweight omega chain and improved method of manufacture - Google Patents
Lightweight omega chain and improved method of manufacture Download PDFInfo
- Publication number
- US20040221570A1 US20040221570A1 US10/863,736 US86373604A US2004221570A1 US 20040221570 A1 US20040221570 A1 US 20040221570A1 US 86373604 A US86373604 A US 86373604A US 2004221570 A1 US2004221570 A1 US 2004221570A1
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- US
- United States
- Prior art keywords
- chain
- set forth
- mesh
- core
- precious
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
- A44C5/02—Link constructions
- A44C5/025—Link constructions with links threaded on a band
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C11/00—Watch chains; Ornamental chains
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F43/00—Making bands, e.g. bracelets, or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21L—MAKING METAL CHAINS
- B21L1/00—Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape
- B21L1/02—Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape by bending the ends of the workpieces to abut
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21L—MAKING METAL CHAINS
- B21L11/00—Making chains or chain links of special shape
- B21L11/005—Making ornamental chains
Definitions
- This invention relates generally to the field of jewelry, and more particularly relates to an ornamental jewelry chain wherein the chain is flexible, made of segmented portions with a hollow core mesh.
- the style of jewelry chain that this invention pertains is commonly referred to as “omega.”
- a flexible substrate such as a woven wire mesh sheet
- the woven mesh is threaded into a plurality of independent links in an end-to-end abutting relation.
- the thus preformed chain section is placed between the upper and lower dies of a press.
- the links are then generally uniformly pressed onto the substrate, causing the links to deflect and come into substantial contact with the substrate.
- the resulting cross sectional shape of the chain is dictated by the contour of the upper and lower dies of the press.
- the finished chain remains contiguous, but is flexible due to the fact that the links are independent of one another and are supported by the flexible mesh substrate. In this manner, very attractive jewelry items have been created that appear rigid, but are flexible and thus appealing to the wearer and resistant to permanent deformation and disfigurement.
- the core of these jewelry chains is made out of a solid precious metal creating an undesirably heavy piece of jewelry.
- OMEGA chains are very expensive because OMEGA chains are generally very heavy and are made out of precious metals such as gold, platinum and various metal alloys. With the high cost of gold and other precious metals, it has become extremely expensive to manufacture jewelry using these materials. Furthermore, the average consumer acquisitive capacity has suffered a decline, such decline being felt by the average individual jewelry manufacturer in most developed countries. Jewelry manufacturers in general and the jewelry chain manufacturers in particular have focused and long sought to create products that appear aesthetically similar to the heavier product of solid gold chains but are much lighter in weight and (sought to reduce the amount of precious metal involved in the application). This similarity is achieved by using a lesser amount of precious material content in the jewelry object being manufactured without altering the appearance and look of such heavier jewelry object.
- a method of manufacturing a decorative chain that is attractive, flexible and lightweight involves first providing a length of woven wire mesh made with a hollow seamed wire with a non precious core, and then removing the non precious core by a process selected from a group consisting of chemical, thermal and mechanical removal.
- the materials used for the non precious core can be selected from a group consisting of aluminum, steel, copper and any other suitable material or materials.
- the link segments are arranged in an end-to-end abutting relationship to form a preformed chain. These link segments can have identical or varying widths.
- a plate in another embodiment, can be wrapped over the woven wire mesh, the plate being arranged in a side-to-side abutting relationship to form a preformed chain.
- the preformed chain can be placed between die members of a press and the working surfaces of the die members can be brought into contact with the link segments, subjecting the preformed chain to a pressing force for a duration of time.
- the duration of time that is needed is such that is sufficient to cause the link segments to deform into a configuration corresponding to the contour of the die members.
- a series of spirals is used, preferably made from a continuous thin plate or flattened wire and resembling a spring.
- the woven wire mesh is introduced inside the spiral, and the decorative chain preferably formed as described above.
- FIG. 1 is a view of a wire mesh made with a hollow wire in accordance with this invention.
- FIG. 2 is a perspective view of a seamless hollow wire cross section in accordance with this invention.
- FIG. 3 is a perspective view of a hollow wire cross section with the non-precious metal core still in place in accordance with this invention.
- FIG. 4 is a perspective view of a hollow wire cross section without the non-precious metal core in accordance with this invention.
- FIG. 5 is a perspective view of a single link, without the wire mesh.
- FIG. 6 illustrates preformed links being slid over a mesh substrate during assembling of jewelry chain in accordance with this invention.
- FIG. 7 is a back perspective view of a portion of a jewelry chain manufactured utilizing alternatively-shaped link segments.
- FIG. 8 is a perspective view of a single link, without the wire mesh, after it is formed and shaped into the final state.
- FIG. 9 is a perspective view illustrating the process of assembling link segments simultaneously with the formation of a preformed chain.
- FIG. 10 is a partial exploded view of a finished jewelry chain manufactured in accordance with this invention.
- FIG. 11 is a perspective view illustrating an “avvolto” embodiment of this invention.
- the present method in making Omega chains includes initially providing a length of hollow wire that is woven into a “fabric” or mesh 2 , as shown in FIG. 1.
- This mesh 2 is very flexible and can be cut longitudinally to any desired width without losing the flexibility or continuity.
- the hollow wire can be made by any of the various well-known methods, such as being made out of a seamless tube 4 , as shown in FIG. 2, or being made with a non-precious metal core that is chemically, thermally or mechanically removed once the mesh 2 is made.
- This mesh 2 is generally made of a solid wire that is round in cross section, but could also be made with wires of different cross sections.
- Another method of creating a hollow wire is by longitudinally wrapping a thin sheet of precious metal around a non precious metal round wire in a manner that a small seam or gap runs along the entire length of the wire so formed. This seam or gap allows the core to be etched out after the wire mesh is formed.
- Yet another method of making a hollow wire suitable for making the hollow mesh 2 is one known as “aggraffato,” as shown in FIGS. 3 and 4, where the longitudinal edges 6 of the precious metal 8 are embedded into the non-precious core 10 .
- This method allows the manufacturing of hollow wire with any desirable wall thickness suitable for use in an automatic chain making machine. Because the precious metal 8 sheet is partially embedded into the core 10 , it does not peel off when twisted or bent.
- the hollow wire 12 with or without the non-precious core 10 , can be then woven into a mesh 2 .
- the wire mesh 2 can be then cut into strips of the required width and the strips of mesh 2 can be then hammered or pressed to a desired width and thickness to fit the tubular links 14 , as shown in FIG. 5.
- the pressing or hammering of the strips of the mesh 2 is done to uniform the width and thickness of the mesh 2 and also to avoid that any single element, a small segment of a spiral, would move from its position making the insertion of the mesh 2 into the links 14 extremely difficult.
- the non-precious metal 10 can be removed or etched out.
- Common cores used in this process are aluminum, steel and/or copper and alloys thereof, however other suitable materials may be used. These cores can be easily etched out, using etching agents such as acids or caustic chemicals.
- the mesh 2 itself can be inserted into a series of hollow link sections 14 such that the interior surfaces 16 of the links surround the hollow mesh 2 .
- These link sections 14 are generally rectangular in cross-section and the width of the mesh 2 is generally the inner width of the links 14 . It is important to note, however, that a chain of varying width can be manufactured.
- One example includes the use of mesh 2 and links 14 having a gradually changing width. Naturally, the upper and lower dies utilized to create the finished chain are configured to match.
- the links 14 can be arranged in an end-to-end abutting relationship upon the mesh 2 , and this preformed chain can be placed between the upper and lower die members of a press.
- the magnitude of pressure and the duration of time that is sufficient to deform the links and bring the inner surfaces thereof into at least partial engagement with the mesh 2 can be used.
- An example of a single link 15 that is formed and shaped into the final state is shown at FIG. 8.
- the contour of the operating surfaces of the upper and lower dies may be of any desired shape and/or radius. It is also possible, by utilizing the present method, to create a chain having various cross sections, symmetric and asymmetric as well.
- the link segments 18 may be in the form of box-like segments formed through a separate manufacturing process, or may be formed over the hollow mesh 2 from flat or staple-shaped links 18 that are wrapped around the hollow mesh 2 in a pre-pressing step or during the actual creation of the chain with the dies.
- This facilitates easier manipulation of the chain before final pressing/assembly, wherein the links 18 can be fit accurately together and the chain can be cleaned prior to the final pressing step.
- An example of a completed chain 20 having a portion 22 removed is shown in FIG. 10.
- FIG. 11 Another product that can be manufactured with a hollow wire mesh 2 is the one known as “avvolto,” where the outside links are substituted by a spiral 24 made of a thin plate.
- the spiral 24 of generally rectangular cross section can be made from a continuous thin plate or flattened wire that also has a generally rectangular cross section.
- the spiral 24 formed resembles a tight spring having a rectangular cross section.
- the hollow wire mesh 2 can be introduced inside the spiral and the chain formed can be pressed in the same manner as described above. This pressing may be carried out by stamping, rolling, or any other suitable means.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Adornments (AREA)
Abstract
Description
- This patent application is a continuation-in-part of to application Ser. No. 10/157,952 filed May 28, 2002 for LIGHTWEIGHT MEGA CHAINA AND IMPROVED METHOD OF MANUFACTURE, now abandoned.
- 1. Field of the Invention
- This invention relates generally to the field of jewelry, and more particularly relates to an ornamental jewelry chain wherein the chain is flexible, made of segmented portions with a hollow core mesh.
- 2. Description of the Related Art
- The style of jewelry chain that this invention pertains is commonly referred to as “omega.” To manufacture an omega-style chain, a flexible substrate, such as a woven wire mesh sheet, is provided. The woven mesh is threaded into a plurality of independent links in an end-to-end abutting relation. The thus preformed chain section is placed between the upper and lower dies of a press. The links are then generally uniformly pressed onto the substrate, causing the links to deflect and come into substantial contact with the substrate. The resulting cross sectional shape of the chain is dictated by the contour of the upper and lower dies of the press. The finished chain remains contiguous, but is flexible due to the fact that the links are independent of one another and are supported by the flexible mesh substrate. In this manner, very attractive jewelry items have been created that appear rigid, but are flexible and thus appealing to the wearer and resistant to permanent deformation and disfigurement. The core of these jewelry chains is made out of a solid precious metal creating an undesirably heavy piece of jewelry.
- In general, the manufacturing of OMEGA chains is very expensive because OMEGA chains are generally very heavy and are made out of precious metals such as gold, platinum and various metal alloys. With the high cost of gold and other precious metals, it has become extremely expensive to manufacture jewelry using these materials. Furthermore, the average consumer acquisitive capacity has suffered a decline, such decline being felt by the average individual jewelry manufacturer in most developed countries. Jewelry manufacturers in general and the jewelry chain manufacturers in particular have focused and long sought to create products that appear aesthetically similar to the heavier product of solid gold chains but are much lighter in weight and (sought to reduce the amount of precious metal involved in the application). This similarity is achieved by using a lesser amount of precious material content in the jewelry object being manufactured without altering the appearance and look of such heavier jewelry object.
- Therefore, it would be desirable to manufacture jewelry that looks aesthetically similar to the OMEGA style jewelry, but weighs much lighter and costs much less to manufacture.
- A method of manufacturing a decorative chain that is attractive, flexible and lightweight is described. The steps involve first providing a length of woven wire mesh made with a hollow seamed wire with a non precious core, and then removing the non precious core by a process selected from a group consisting of chemical, thermal and mechanical removal. The materials used for the non precious core can be selected from a group consisting of aluminum, steel, copper and any other suitable material or materials. Then after passing a series of independent link segments over the woven wire mesh, the link segments are arranged in an end-to-end abutting relationship to form a preformed chain. These link segments can have identical or varying widths.
- In another embodiment, a plate can be wrapped over the woven wire mesh, the plate being arranged in a side-to-side abutting relationship to form a preformed chain. Next, the preformed chain can be placed between die members of a press and the working surfaces of the die members can be brought into contact with the link segments, subjecting the preformed chain to a pressing force for a duration of time. The duration of time that is needed is such that is sufficient to cause the link segments to deform into a configuration corresponding to the contour of the die members.
- In yet another embodiment, rather than independent link segments a series of spirals is used, preferably made from a continuous thin plate or flattened wire and resembling a spring. The woven wire mesh is introduced inside the spiral, and the decorative chain preferably formed as described above.
- It is, therefore, a principal object of this invention to provide ornamental, flexible jewelry chain that is substantially lighter, but maintains the look and appearance of an ‘OMEGA’ and can be made into a necklace, bracelet or any other chain-type jewelry.
- It is another object of the present invention to reduce the cost of OMEGA style jewelry products by reducing the amount of precious metal required to construct the jewelry product.
- These and other objects and advantages of the present invention will be apparent from a review of the following specification and accompanying drawings.
- FIG. 1 is a view of a wire mesh made with a hollow wire in accordance with this invention.
- FIG. 2 is a perspective view of a seamless hollow wire cross section in accordance with this invention.
- FIG. 3 is a perspective view of a hollow wire cross section with the non-precious metal core still in place in accordance with this invention.
- FIG. 4 is a perspective view of a hollow wire cross section without the non-precious metal core in accordance with this invention.
- FIG. 5 is a perspective view of a single link, without the wire mesh.
- FIG. 6 illustrates preformed links being slid over a mesh substrate during assembling of jewelry chain in accordance with this invention.
- FIG. 7 is a back perspective view of a portion of a jewelry chain manufactured utilizing alternatively-shaped link segments.
- FIG. 8 is a perspective view of a single link, without the wire mesh, after it is formed and shaped into the final state.
- FIG. 9 is a perspective view illustrating the process of assembling link segments simultaneously with the formation of a preformed chain.
- FIG. 10 is a partial exploded view of a finished jewelry chain manufactured in accordance with this invention.
- FIG. 11 is a perspective view illustrating an “avvolto” embodiment of this invention.
- The detailed description set forth below in connection with the appended drawings is intended as a description of presently-preferred embodiments of the invention and is not intended to represent the only forms in which the present invention may be constructed and/or utilized. The description sets forth the functions and the sequence of steps for constructing and operating the invention in connection with the illustrated embodiments. It is to be understood, however, that the same or equivalent functions and sequences may be accomplished by different embodiments that are also intended to be encompassed within the spirit and scope of the invention.
- The present method in making Omega chains includes initially providing a length of hollow wire that is woven into a “fabric” or
mesh 2, as shown in FIG. 1. Thismesh 2 is very flexible and can be cut longitudinally to any desired width without losing the flexibility or continuity. The hollow wire can be made by any of the various well-known methods, such as being made out of a seamless tube 4, as shown in FIG. 2, or being made with a non-precious metal core that is chemically, thermally or mechanically removed once themesh 2 is made. Thismesh 2 is generally made of a solid wire that is round in cross section, but could also be made with wires of different cross sections. - Another method of creating a hollow wire is by longitudinally wrapping a thin sheet of precious metal around a non precious metal round wire in a manner that a small seam or gap runs along the entire length of the wire so formed. This seam or gap allows the core to be etched out after the wire mesh is formed.
- Yet another method of making a hollow wire suitable for making the
hollow mesh 2 is one known as “aggraffato,” as shown in FIGS. 3 and 4, where thelongitudinal edges 6 of theprecious metal 8 are embedded into the non-preciouscore 10. This method allows the manufacturing of hollow wire with any desirable wall thickness suitable for use in an automatic chain making machine. Because theprecious metal 8 sheet is partially embedded into thecore 10, it does not peel off when twisted or bent. - The
hollow wire 12, with or without thenon-precious core 10, can be then woven into amesh 2. Thewire mesh 2 can be then cut into strips of the required width and the strips ofmesh 2 can be then hammered or pressed to a desired width and thickness to fit thetubular links 14, as shown in FIG. 5. The pressing or hammering of the strips of themesh 2 is done to uniform the width and thickness of themesh 2 and also to avoid that any single element, a small segment of a spiral, would move from its position making the insertion of themesh 2 into thelinks 14 extremely difficult. - Once the
mesh 2 has been hammered or pressed to the proper size, thenon-precious metal 10 can be removed or etched out. Common cores used in this process are aluminum, steel and/or copper and alloys thereof, however other suitable materials may be used. These cores can be easily etched out, using etching agents such as acids or caustic chemicals. - As shown in FIGS. 6 and 7, once the
core 10 of the wire forming themesh 2 has been removed, themesh 2 itself can be inserted into a series ofhollow link sections 14 such that the interior surfaces 16 of the links surround thehollow mesh 2. Theselink sections 14 are generally rectangular in cross-section and the width of themesh 2 is generally the inner width of thelinks 14. It is important to note, however, that a chain of varying width can be manufactured. One example includes the use ofmesh 2 andlinks 14 having a gradually changing width. Naturally, the upper and lower dies utilized to create the finished chain are configured to match. Thelinks 14 can be arranged in an end-to-end abutting relationship upon themesh 2, and this preformed chain can be placed between the upper and lower die members of a press. The magnitude of pressure and the duration of time that is sufficient to deform the links and bring the inner surfaces thereof into at least partial engagement with themesh 2 can be used. An example of asingle link 15 that is formed and shaped into the final state is shown at FIG. 8. The contour of the operating surfaces of the upper and lower dies may be of any desired shape and/or radius. It is also possible, by utilizing the present method, to create a chain having various cross sections, symmetric and asymmetric as well. - As shown in FIG. 9, the
link segments 18 may be in the form of box-like segments formed through a separate manufacturing process, or may be formed over thehollow mesh 2 from flat or staple-shapedlinks 18 that are wrapped around thehollow mesh 2 in a pre-pressing step or during the actual creation of the chain with the dies. In addition, it has been found to be desirable to first press thelinks 18 into contact with themesh 2 with a lighter pressing force than what is to be used in a final pressing step, so as to secure thelinks 18 preliminarily to themesh 2. This facilitates easier manipulation of the chain before final pressing/assembly, wherein thelinks 18 can be fit accurately together and the chain can be cleaned prior to the final pressing step. An example of a completedchain 20 having aportion 22 removed is shown in FIG. 10. - Another product that can be manufactured with a
hollow wire mesh 2 is the one known as “avvolto,” where the outside links are substituted by a spiral 24 made of a thin plate. Please see FIG. 11. In this case, thespiral 24 of generally rectangular cross section can be made from a continuous thin plate or flattened wire that also has a generally rectangular cross section. The spiral 24 formed resembles a tight spring having a rectangular cross section. Thehollow wire mesh 2 can be introduced inside the spiral and the chain formed can be pressed in the same manner as described above. This pressing may be carried out by stamping, rolling, or any other suitable means. - While the present invention has been described with regards to particular embodiments, it is recognized that additional variations of the present invention may be devised without departing from the inventive concept.
Claims (24)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/863,736 US6895737B2 (en) | 2002-05-28 | 2004-06-07 | Lightweight omega chain and improved method of manufacture |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15795202A | 2002-05-28 | 2002-05-28 | |
US10/216,019 US6745554B2 (en) | 2002-05-28 | 2002-08-08 | Lightweight omega chain and improved method of manufacture |
US10/863,736 US6895737B2 (en) | 2002-05-28 | 2004-06-07 | Lightweight omega chain and improved method of manufacture |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/216,019 Continuation US6745554B2 (en) | 2002-05-28 | 2002-08-08 | Lightweight omega chain and improved method of manufacture |
Publications (2)
Publication Number | Publication Date |
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US20040221570A1 true US20040221570A1 (en) | 2004-11-11 |
US6895737B2 US6895737B2 (en) | 2005-05-24 |
Family
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US10/216,019 Expired - Fee Related US6745554B2 (en) | 2002-05-28 | 2002-08-08 | Lightweight omega chain and improved method of manufacture |
US10/863,736 Expired - Fee Related US6895737B2 (en) | 2002-05-28 | 2004-06-07 | Lightweight omega chain and improved method of manufacture |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/216,019 Expired - Fee Related US6745554B2 (en) | 2002-05-28 | 2002-08-08 | Lightweight omega chain and improved method of manufacture |
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US (2) | US6745554B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20090241341A1 (en) * | 2008-03-25 | 2009-10-01 | Arin S.A. | Method of forming a jewelry chain and chain formed therefrom |
US20090241598A1 (en) * | 2008-03-25 | 2009-10-01 | Arin S.A. | Method of forming hollow and solid jewelry chains and chains formed therefrom |
CN107413900A (en) * | 2017-06-09 | 2017-12-01 | 深圳市翠绿首饰制造有限公司 | Pipe structure with open slot, its process equipment and its processing method |
CN116765316A (en) * | 2023-06-27 | 2023-09-19 | 江苏大力神链传动有限公司 | Chain distortion correcting device and method |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040237583A1 (en) * | 2001-11-19 | 2004-12-02 | Pietro Rancan | Omega type ornamental chain and process for making the chain |
ITVI20010072A1 (en) * | 2001-03-26 | 2002-09-26 | Roana Antonio E Figli Snc | ORNAMENTAL PURPOSE OF THE SO-CALLED "SCROLLED OR DEGRADE" TYPE |
US6860097B2 (en) * | 2002-08-08 | 2005-03-01 | Lightweight omega chain and improved method of manufacture | |
US6745554B2 (en) * | 2002-05-28 | 2004-06-08 | Aurafin-Oro America, Llc | Lightweight omega chain and improved method of manufacture |
ITAR20020023A1 (en) * | 2002-06-25 | 2003-12-29 | Orocinque S P A | PROCEDURE FOR THE PRODUCTION OF ANIMATED WIRE OR PLATE FOR THE PRODUCTION OF TWO-COLOR ORNAMENTAL ITEMS AND ARTICLES SO MADE |
US20080245048A1 (en) * | 2007-04-07 | 2008-10-09 | Linda Marie Moore | Life-link |
US20090056178A1 (en) * | 2007-08-30 | 2009-03-05 | Bandelz, Inc. | Display marker bands |
EP2050350A1 (en) * | 2007-10-15 | 2009-04-22 | Silmar S.p.A. | Procedure for the production of jewellery items, in particular ropes or chains, and items obtainable through such procedure |
ITFI20130116A1 (en) * | 2013-05-21 | 2014-11-22 | Area 51 S R L | PROCEDURE FOR THE REALIZATION OF ORAFI PRODUCTS |
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Cited By (4)
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US20090241341A1 (en) * | 2008-03-25 | 2009-10-01 | Arin S.A. | Method of forming a jewelry chain and chain formed therefrom |
US20090241598A1 (en) * | 2008-03-25 | 2009-10-01 | Arin S.A. | Method of forming hollow and solid jewelry chains and chains formed therefrom |
CN107413900A (en) * | 2017-06-09 | 2017-12-01 | 深圳市翠绿首饰制造有限公司 | Pipe structure with open slot, its process equipment and its processing method |
CN116765316A (en) * | 2023-06-27 | 2023-09-19 | 江苏大力神链传动有限公司 | Chain distortion correcting device and method |
Also Published As
Publication number | Publication date |
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US6895737B2 (en) | 2005-05-24 |
US6745554B2 (en) | 2004-06-08 |
US20030221408A1 (en) | 2003-12-04 |
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